Eva Gallagher on fri 27 jan 12
Hi Ron - here are the tests of the adjusted white salt recipe that you sent
me.
http://www.flickr.com/photos/18590247@N03/
All done on Bmix cone 10 as I have runout of HHP tiles. Showing front and
back - back stained with red FeO to show crazing. Couldn't see crazng on th=
e
adjusted, but the glaze looks totally different and ran.
Left tile adjusted recipe with spod; middle tile original white salt -
thinish; right tile original white salt - thick.
The original recipe was Neph Sye 71.6
Ball Clay 4.8
Dolomite 23.6
Add Zirco 18.8, rutile 1 and bento 4
Your adjusted was:
NEPH SY..................... 20.00
> Tanko Spod.................. 50.00
> OM-4........................ 5.00
> DOLOMITE.................... 25.00
> =3D=3D=3D=3D=3D=3D=3D=3D=3D
> 100.00
>
> CaO 0.33*
> MnO2 0.00
> Li2O 0.27*
> MgO 0.30*
> K2O 0.03*
> Na2O 0.08*
> Fe2O3 0.00
> TiO2 0.00
> Al2O3 0.42
> SiO2 1.82
> P2O5 0.00
>
> Si:Al: 4.32 <<< was 4.34
> SiB:Al: 4.32
> Thermal Expansion: 418.75 <<< was 712.56
> Formula Weight: 199.15
> I think that I will order some new spod as the bucket we have is from th=
e
> > 1990's adn very grey in colour and so may have affected the colour.
Thanks again,
Eva Gallagaher
Deep River, Ontario
http://newfoundoutpotter.blogspot.com/
----- Original Message -----
From:
To: "Eva Gallagher"
Sent: Tuesday, November 22, 2011 8:56 AM
Subject: Re: Yellow Salt Glaze problem.
> Hi Eve,
>
> Here it is with the expansion reduced enough so it should not craze -
> but - it's a recrystallized matte and they don't follow the usual rules
> when it comes to expansion so I'm not at all sure this will work - let m=
e
> know what happens please.
>
> RR revised white salt
>
> NEPH SY..................... 20.00
> Tanko Spod.................. 50.00
> OM-4........................ 5.00
> DOLOMITE.................... 25.00
> =3D=3D=3D=3D=3D=3D=3D=3D=3D
> 100.00
>
> CaO 0.33*
> MnO2 0.00
> Li2O 0.27*
> MgO 0.30*
> K2O 0.03*
> Na2O 0.08*
> Fe2O3 0.00
> TiO2 0.00
> Al2O3 0.42
> SiO2 1.82
> P2O5 0.00
>
> Si:Al: 4.32 <<< was 4.34
> SiB:Al: 4.32
> Thermal Expansion: 418.75 <<< was 712.56
> Formula Weight: 199.15
>
> R
>
ronroy@CA.INTER.NET on sun 29 jan 12
Hi Eve,
When you add a new oxide (flux in this case Lithium) you usually get
more melt - I should have sent a line blend to take that into account
- Here are two more about the same calculated expansion but are more
refractory - mix up each and test then mix together to get the middle
one (revision #3) - this should do it - don't forget the zircopax and
rutile.
If any happen to craze I still have lots of room to adjust for that.
Revision #2
NEPH SY..................... 20.00
DOLOMITE.................... 25.00
OM-4........................ 8.00
Tanko Spod.................. 47.00
=3D=3D=3D=3D=3D=3D=3D=3D=3D
100.00
Revision #4
NEPH SY..................... 20.00
DOLOMITE.................... 25.00
OM-4........................ 14.00
Tanko Spod.................. 41.00
=3D=3D=3D=3D=3D=3D=3D=3D=3D
100.00
RR
Quoting Eva Gallagher :
> Hi Ron - here are the tests of the adjusted white salt recipe that
> you sent me.
> http://www.flickr.com/photos/18590247@N03/
>
> All done on Bmix cone 10 as I have runout of HHP tiles. Showing
> front and back - back stained with red FeO to show crazing. Couldn't
> see crazng on the adjusted, but the glaze looks totally different
> and ran.
>
> Left tile adjusted recipe with spod; middle tile original white
> salt - thinish; right tile original white salt - thick.
> The original recipe was Neph Sye 71.6
> Ball Clay 4.8
> Dolomite 23.6
> Add Zirco 18.8, rutile 1 and bento 4
> Your adjusted was:
> NEPH SY..................... 20.00
>> Tanko Spod.................. 50.00
>> OM-4........................ 5.00
>> DOLOMITE.................... 25.00
>> =3D=3D=3D=3D=3D=3D=3D=3D=3D
>> 100.00
>>
>> CaO 0.33*
>> MnO2 0.00
>> Li2O 0.27*
>> MgO 0.30*
>> K2O 0.03*
>> Na2O 0.08*
>> Fe2O3 0.00
>> TiO2 0.00
>> Al2O3 0.42
>> SiO2 1.82
>> P2O5 0.00
>>
>> Si:Al: 4.32 <<< was 4.34
>> SiB:Al: 4.32
>> Thermal Expansion: 418.75 <<< was 712.56
>> Formula Weight: 199.15
>> I think that I will order some new spod as the bucket we have is
>> from the > 1990's adn very grey in colour and so may have affected
>> the colour.
> Thanks again,
> Eva Gallagaher
> Deep River, Ontario
> http://newfoundoutpotter.blogspot.com/
>
>
>
> ----- Original Message ----- From:
> To: "Eva Gallagher"
> Sent: Tuesday, November 22, 2011 8:56 AM
> Subject: Re: Yellow Salt Glaze problem.
>
>
>> Hi Eve,
>>
>> Here it is with the expansion reduced enough so it should not craze -
>> but - it's a recrystallized matte and they don't follow the usual rules
>> when it comes to expansion so I'm not at all sure this will work - let =
me
>> know what happens please.
>>
>> RR revised white salt
>>
>> NEPH SY..................... 20.00
>> Tanko Spod.................. 50.00
>> OM-4........................ 5.00
>> DOLOMITE.................... 25.00
>> =3D=3D=3D=3D=3D=3D=3D=3D=3D
>> 100.00
>>
>> CaO 0.33*
>> MnO2 0.00
>> Li2O 0.27*
>> MgO 0.30*
>> K2O 0.03*
>> Na2O 0.08*
>> Fe2O3 0.00
>> TiO2 0.00
>> Al2O3 0.42
>> SiO2 1.82
>> P2O5 0.00
>>
>> Si:Al: 4.32 <<< was 4.34
>> SiB:Al: 4.32
>> Thermal Expansion: 418.75 <<< was 712.56
>> Formula Weight: 199.15
>>
>> R
>>
>
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